发明名称 |
OPTICAL PICKUP AND OPTICAL RECORDING APPARATUS |
摘要 |
<p>An optical pickup is capable of projecting laser beams having different polarization directions or different divergence angles from laser sources formed in a surface emitting laser array and varying the effective numerical aperture of an optical system provided with an objective lens and the like. The optical pickup has a high-degree compatibility with both a CD-standards optical disk having a low recording density and a large thickness and a DVD-standards optical disk having a high recording density and a small thickness. Furthermore, a plurality of laser sources can be formed in a compact space by adopting the surface emitting laser array, and the numerical aperture of the optical system can be controlled by making a selection of laser beams. Accordingly, it is possible to realize an optical pickup having compatibility by means of an extremely simple construction, and it is also possible to inexpensively provide a small-size high-performance optical pickup. <IMAGE></p> |
申请公布号 |
EP0831472(B1) |
申请公布日期 |
2003.09.03 |
申请号 |
EP19970905472 |
申请日期 |
1997.03.10 |
申请人 |
SEIKO EPSON CORPORATION |
发明人 |
KITAMURA, SHOJIRO;MORI, KATSUMI;KONDO, TAKAYUKI;KANEKO, TAKEO;ARIMURA, TOSHIO |
分类号 |
G11B7/00;G11B7/0037;G11B7/12;G11B7/125;G11B7/135;(IPC1-7):G11B7/135 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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